Abstract: Method for the production of heat resistant polyethyleneterephthalate containers by means of thermoforming with a longitudinal and radial direction stretching of a sheet (1) of unstretched amorphous polymer in a die (2) kept at a temperature of about 175.degree.-180.degree. C. The container is consolidated and extracted by a counterdie (4), cooled and provided with suction means. The containers thus are stable at sterilization temperature in boiling water and in steam at 130.degree. C.

Abstract: Container designed for fizzy drinks made in heat-moulded plastic material, preferably in polyethyleneterephthalate and provided with a heat-moulded plastic cover heat-sealed to the body of the container, the base (6) and cover (13) of which have a shape which is convex towards the center of the said container. The container can absorb the variations in pressure that the fizzy drink generates in various environmental conditions, and simultaneously, can compensate for the osmotic losses of gas. The container is furthermore provided with a shape (11, 12) of the cover and a shape (4, 5) of the base which allows side-by-side storage of the containers and stacking one above the other in a warehouse, and also the insertion into the cover of an opening device (15, 25) for pull-off or push-down opening.